The conservative Washington Post columnist and Fox News contributor was tactful in his bashing of Christine O’Donnell on The O’Reilly Factor Thursday night. Krauthammer said he would still vote Republican if he were a Delaware resident, but that he believes it was “a huge mistake to jeopardize a seat in Delaware which was absolutely in the pocket without almost any contention and to jeopardize it with a much weaker candidate who I think is overwhelmingly likely to lose.” He cited “Bill Buckley’s rule” that the Republicans should “always support the… most conservative candidate who was electable.”